Instructions
Travel to the gym in Pewter City and fight the first gym leader, Brock. Use any water or grass pokemon in your bag to deal with his two rock pokemon.
Go to the Cerulean City gym and fight the second gym leader, Misty. Use any grass or electric pokemon you have, as they are highly effective against Misty's water pokemon.
Go to the Vermilion City gym. Use ground pokemon, such as Diglett, to counter gym leader Surge's electric pokemon.
Travel to Celadon City and fight the fourth trainer, Erika, in the city's gym. Use the fire pokemon to deal with Erika's grass pokemon.
Travel to the Saffron City gym and fight the fifth trainer, Sabrina. Use the bug type pokemon such as Butterfree to fight Sabrina's psychic pokemon.
Go to the Fuchsia City gym and fight Koga. Use a psychic pokemon, such as a Kadabra, to easily defeat all of Koga's poison pokemon.
Go to Cinnabar Island and fight the seventh gym leader, Blaine, at Cinnabar Island's gym. Use your water pokemon which will easily overpower Blaine's fire pokemon.
Go to the Viridian City gym to fight the eighth and last trainer, Giovanni. Use your psychic and water type pokemon to easily defeat Giovanni's ground pokemon.